A
space traveler about to leave for the moon has a spring balance and a 1.0 kg
mass A, which when hung on the balance on the Earth gives the reading of 9.8
newtons. Arriving at the moon at a place where the acceleration of gravity is
not known exactly but has a value of about 1/6 the acceleration of gravity at
the Earth's surface, he picks up a stone B which gives a reading of 9.8 newtons
when weighed on the spring balance. He then hangs A and B over a pulley as shown
in the figure and observes that B falls with an acceleration of 1.2 m s–2
. What is the mass of stone B?

Answer:
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